Michael I. Kotlikoff and Martha E. Pollack, President, Cornell University write: Colleges and universities in the U.S. face a difficult choice in the coming weeks. Some have decided that closing their campuses and offering online classes is the safest option. For others, the safer and more responsible alternative may be to allow students to return while putting in place a comprehensive virus-screening program that minimizes the risk of transmission. Contingent on New York state’s approval, we will be opening Cornell for residential instruction this fall.